A gunman who killed one person outside a Boulder restaurant was stopped by a brave chef who tackled the killer and wrestled him to the ground.

The shooting occurred outside the Bramble and Hare restaurant just after midnight on Monday, after two men got into an argument.

The men continued their altercation outside, where shots were fired and one of the men felled; the gunman then returned to the restaurant, where he was stopped by the brave staff member, 9News reported.

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Shooting: A man was shot outside the Bramble and Hare restaurant (center) after midnight on Monday; the shooter was then tackled by the restaurant's chef and held until cops came

The suspect was taken into custody after the chef wrestled him to the ground and held him until police arrived.

It's not yet clear what the shooter and the victim were arguing about.

Police said they are still determining whether more shots were fired when the gunman - who hasn't been identified - went inside the restaurant.

The victim, an adult male, died of his injuries at Boulder Community Health's Foothills Hospital.

He is not being identified by the Boulder County Coroner's Office until his family has been informed of his death.

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The shooting has not affected the annual Bolder Boulder race.

Anyone with information is asked to call the Boulder Police Department at 303 441 1974.

Anonymous tippers can contact Crime Stoppers at 1 800 222 TIPS (8477), or at crimeshurt.com; those who inform Crime Stoppers can get a cash reward of up to $1,000 for tips that lead to an arrest and filing of charges.

Unidentified: None of those involved in the shooting outside the restaurant (center) have yet been identified by police. It's also not yet clear whether more shots were fired inside